test(#93): key injected mode/chmod maps on as_posix() for the Windows runner

permission_status/fix_permissions wrap paths in the running OS's Path class, so
on the windows-latest CI job str(p) uses backslashes and the fixture dict lookups
miss — the same portability trap fixed for #91. Normalise with Path(p).as_posix()
in the four affected lambdas. Pure test fix; production code unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_core.py

@@ -3428,10 +3428,13 @@ def test_sidecar_status_none_for_unknown_package():
 # Filesystem permission pre-flight (issue #93)
 # --------------------------------------------------------------------------- #
 def test_permission_status_ok_when_0600():
+    # NOTE: key the injected mode map on Path(p).as_posix() — on the Windows CI
+    # runner permission_status wraps the path in a WindowsPath, so str(p) would
+    # use backslashes and miss the lookup (the same portability trap as #91).
     st = c.permission_status(
         "/cfg/config.toml",
         platform="darwin",
-        stat_mode=lambda p: {"/cfg/config.toml": 0o600, "/cfg": 0o700}.get(str(p)),
+        stat_mode=lambda p: {"/cfg/config.toml": 0o600, "/cfg": 0o700}.get(Path(p).as_posix()),
     )
     assert st["ok"] is True
     assert st["mode"] == 0o600
@@ -3442,7 +3445,7 @@ def test_permission_status_blocks_group_world_readable_file():
     st = c.permission_status(
         "/cfg/config.toml",
         platform="linux",
-        stat_mode=lambda p: {"/cfg/config.toml": 0o644, "/cfg": 0o755}.get(str(p)),
+        stat_mode=lambda p: {"/cfg/config.toml": 0o644, "/cfg": 0o755}.get(Path(p).as_posix()),
     )
     assert st["ok"] is False
     assert st["file_ok"] is False
@@ -3457,7 +3460,7 @@ def test_permission_status_file_bad_dir_ok():
     st = c.permission_status(
         "/cfg/config.toml",
         platform="linux",
-        stat_mode=lambda p: {"/cfg/config.toml": 0o640, "/cfg": 0o700}.get(str(p)),
+        stat_mode=lambda p: {"/cfg/config.toml": 0o640, "/cfg": 0o700}.get(Path(p).as_posix()),
     )
     assert st["file_ok"] is False
     assert st["dir_ok"] is True
@@ -3472,9 +3475,12 @@ def test_permission_status_none_on_windows_and_missing_file():
 
 
 def test_fix_permissions_chmods_file_and_dir():
+    # as_posix() so the recorded paths compare equal on the Windows CI runner too.
     calls = []
     changed, note = c.fix_permissions(
-        "/cfg/config.toml", platform="linux", chmod=lambda p, m: calls.append((str(p), m))
+        "/cfg/config.toml",
+        platform="linux",
+        chmod=lambda p, m: calls.append((Path(p).as_posix(), m)),
     )
     assert changed is True
     assert ("/cfg/config.toml", 0o600) in calls